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Stoves for Heating or Cooking

Author:allen Date:2011-3-18 6:50:15

Briquette stoves vary in design and capacity, and so do their efficiencies. A good briquette stove should ensure smokeless combustion, flexible control, and high heat efficiency over a wide range of combustion rate. Light in weight and easy to move sometimes is important for household use. High combustion temperature is required for restaurant use. Convenience in ash removal is also a consideration in design. The method of feeding new briquettes to the stove often contradicts the requirement of smokeless combustion. Since if the new briquette is to he put on top of the burning briquette, smoke is likely to come out because volatile matter in coal leaves under high temperature; if the new briquette is fed under the burning briquette, smoke may burn away while coming out but it creates a lot of problems in designing the feeding mechanism. A new way to solve the problem is so called reverse combustion, where the new briquette is fed on the top but the combustion proceeds downward by a forced draft (see article on page 25 of this issue).

Stoves for household use can be classified as for space heating or for cooking. The stoves for space heating require stable low temperature combustion; the stoves for cooking require quick start and high temperature combustion. Multipurpose stoves have been developed.

Although briquettes are a relatively convenient, safe and cheap fuel, they are not ideal in many aspects such as clean operation and stock, flexible fire control, compact space occupation. Therefore, briquettes are an appropriate fuel only for medium income households in developing countries. When income rises, some of the households may turn to high quality fuels, i.e. piped or bottled gas and electricity. In an economy under quick economic development, the time period when briquettes serves as a major fuel may be short. In South Korea, briquette production has had very fast development in the past decade, but it peaked in mid-eighties, and the market is diminishing now.

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